Tags: Question 8 ... Stomata in rolled leaves. The D leaf is not vaselined and both the surfaces transpire freely releasing much water. Give a suitable explanation for the following: (a) A higher rate of transpiration is recorded on a windy day rather than on a calm day. the movement of water through a plant from the roots up the stem ... Q. The user above me has also a valid statement too ... but it will be more than it was without the rolling up of the leaf. e. Divide the total mass of the leaves by the mass of l cm2 to find the total leaf surface area. Types of Transpiration. A majority (90%) of transpiration takes place via leaf surface, and a process refers as “Foliar transpiration”. Record the calculated total surface area here: _____ 3. Xerophyte adaptations to reduce transpiration ... Spines instead of leaves to reduce surface area for transpiration. the roots, A IF, was also 6 atm. It increases transpiration rate. (b) Potometer is an instrument used for measuring the rate of transpiration in green plants. Transpiration is the loss of water vapour through evaporation from a plant’s surface.It mainly happens through gaps in the leaf called the stomata, which need to open during the daytime to allow gas exchange.Plants need to take in carbon dioxide for photosynthesis and get rid of oxygen, which happens through the stomata. 30 seconds . SURVEY . 9. 3). 4. 10. Whereas the desert plants with thick cuticle and sunken stomata have low rate of transpiration. These rate … The rate at which transpiration occurs refers to the amount of water lost by plants over a given time period. Stomata shielded by hairs. Rolled up leaves reduces the surface area exposed to the lower water potential in the environment therefore reducing rate of transpiration as rate of diffusion is lowered. Experiment to Compare the rate of transpiration from both the surfaces of leaf by Garreau’s Potometer: Wind: higher winds increase the rate of transpiration. The leaf wilts completely in this case. answer choices . (f) Any two parts of a leaf which allow transpiration (g) The structure in a leaf that allows guttation (h) Loss of water as droplets from the margins of certain leaves. On reducing the transpira-tion rate… (c) An instrument used to find the rate of transpiration (d) A plant in which the stomata are sunken (e) The apparatus to record the rate of transpiration in a cut shoot. Calculate the rate of transpiration/surface area. Transpiration. To measure the rate of transpiration we use a piece of equipment called a potometer. The genus Oryza , which includes rice ( Oryza sativa and Oryza glaberrima ) and wild relatives, is a useful genus to study leaf properties in order to identify structural features that control CO2 access to chloroplasts, photosynthesis, water use efficiency, and drought tolerance. Root shoot ratio: Transpiration increases with root shoot ratio. Solution:-(a) False. Greater is the value of resistance; slower will be the transpiration rate. The more the number of stomata per unit area of leaf, the greater is the transpiration. Leaf structure: The leaves with surface stomata, thin cuticle have high rate of transpiration. Plants regulate the rate of transpiration by opening and closing of stomata (Figure 5.14). The unit of transpiration rate is the moles of water lost in per leaf area per time (mol/cm2/s). 2. Tags: Question 9 . It decreases transpiration rate. To do this, divide the rate of transpiration (step 1) by the total surface area. Q. Transpiration is. provided the transpiration rate was low (0.4 g/dm^ leaf/hour) but when the transpiration rate was raised threefold, Afr, rose steeply to a value of 12 atm., a steady state value being approached in about 8 hours (see Fig. A potometer measures how factors such as light, temperature, humidity, light intensity and wind will affect the rate of transpiration. (iv) Voltmeter is an instrument used for measuring the rate of transpiration in green plants. This experiment proves that the rate of stomatal transpiration is fairly higher than the cuticular transpiration. Tightly packed cells in the upper half of the leaf containing many chloroplasts ... Humidity: the lower the humidity the faster the rate of transpiration. The main type of potometer is the ‘bubble’ potometer shown in the figure below. There is a close inter-relationship between transpiration and leaf structure. 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